So you’re looking at a motor, a car spec sheet, or a generator label, and it says kW — but your brain thinks in HP. No worries. Converting kW to HP is one of those things that feels confusing until you see it explained simply.
Here’s the good news: the math is easy, and once you know the formula, you’ll never guess again.
What Is a Kilowatt (kW)?
A kilowatt is a metric unit of power. It’s part of the International System of Units, and it’s used all over the world for:
- Electric motors
- EV power outputs
- Generators
- Solar systems
- Home appliances
- Industrial equipment
One kilowatt equals 1,000 watts. It’s clean, modern, and universal.
What Is Horsepower (hp)?
Horsepower is an older unit of power, popular in the United States and the UK. It was invented by James Watt to compare steam engine power to actual horses.
But here’s the tricky part: there’s more than one type of horsepower.
| Type of Horsepower | Symbol | Watts | kW |
|---|---|---|---|
| Mechanical / Imperial hp | hp(I) | 745.7 W | 0.7457 kW |
| Metric horsepower | PS | 735.5 W | 0.7355 kW |
| Electric horsepower | hp(E) | 746 W | 0.746 kW |
For most everyday conversions — cars, motors, generators — people mean mechanical horsepower. That’s the one we’ll focus on first.
The Simple kW to HP Formula
To convert kW to HP, use this formula:
HP = kW × 1.34102
To go the other way, from HP to kW:
kW = HP × 0.7457
So:
- 1 kW = 1.34102 hp
- 1 hp = 0.7457 kW
That means a 1 kW motor is actually a little stronger than 1 hp. Good to know, right?
kW to HP Quick Conversion Chart
Here’s a handy chart for common values:
| Kilowatts (kW) | Mechanical HP |
|---|---|
| 1 kW | 1.34 hp |
| 2 kW | 2.68 hp |
| 3 kW | 4.02 hp |
| 5 kW | 6.71 hp |
| 7.5 kW | 10.06 hp |
| 10 kW | 13.41 hp |
| 15 kW | 20.12 hp |
| 22 kW | 29.50 hp |
| 30 kW | 40.23 hp |
| 45 kW | 60.35 hp |
| 55 kW | 73.76 hp |
| 75 kW | 100.58 hp |
| 90 kW | 120.69 hp |
| 110 kW | 147.51 hp |
| 132 kW | 177.01 hp |
| 150 kW | 201.15 hp |
| 200 kW | 268.20 hp |
| 250 kW | 335.26 hp |
| 300 kW | 402.31 hp |
| 500 kW | 670.51 hp |
| 1,000 kW | 1,341.02 hp |
Real-World Examples of kW to HP
Let’s make this practical.
Example 1: A 110 kW EV
An electric car with 110 kW of power:
110 × 1.34102 = 147.5 hp
So a 110 kW EV is roughly a 148 hp car.
Example 2: A 150 kW Performance Car
150 × 1.34102 = 201.15 hp
That’s about 201 hp.
Example 3: A 7.5 kW Electric Motor
7.5 × 1.34102 = 10.06 hp
That’s why you’ll often see a “7.5 kW” motor sold as a 10 hp motor.
Example 4: A 5 kW Generator
5 × 1.34102 = 6.71 hp
So a 5 kW generator is roughly a 6.7 hp generator.
Example 5: Going From HP to kW
If you have a 200 hp engine:
200 × 0.7457 = 149.14 kW
So 200 hp is about 149 kW.
kW vs HP: What’s the Real Difference?
Both kW and HP measure power. The difference is mostly historical and regional.
- kW is metric and used worldwide.
- HP is imperial and still common in the US, UK, and automotive culture.
- 1 kW is stronger than 1 hp — about 34% stronger.
- 1 hp equals about 0.746 kW.
If you’re comparing a European car spec in kW to an American car spec in hp, use 1 kW = 1.341 hp.
But if you’re looking at European “PS” or “CV,” that’s metric horsepower, and the conversion is slightly different:
PS = kW × 1.35962
So a 110 kW car is:
- 147.5 mechanical hp
- 149.6 metric PS
Close, but not exactly the same.
Common Mistakes When Converting kW to HP
1. Using 1 kW = 1.36 hp for everything
That’s only true for metric horsepower. For mechanical hp, use 1.341.
2. Confusing hp and PS
Car websites often mix them. A car with “150 PS” is not exactly 150 mechanical hp. It’s about 148 hp.
3. Rounding too early
If you’re doing a precise engineering calculation, keep more decimal places until the end.
4. Forgetting electric horsepower
For some electrical equipment, 1 hp(E) = 746 W exactly. It’s very close to mechanical hp, but not identical.
FAQ: kW to HP
How many HP is 1 kW?
1 kW = 1.34102 mechanical hp.
How many kW is 1 HP?
1 hp = 0.7457 kW.
Is 1 kW equal to 1.36 HP?
Only if you mean metric horsepower (PS). For mechanical hp, it’s 1.341.
How do I convert 100 kW to HP?
100 × 1.34102 = 134.1 hp.
How do I convert 75 kW to HP?
75 × 1.34102 = 100.58 hp.
How do I convert 10 kW to HP?
10 × 1.34102 = 13.41 hp.
The Bottom Line
Converting kW to HP is simple:
Multiply kW by 1.34102 to get mechanical horsepower.
And if you need to go from HP to kW:
Multiply HP by 0.7457.
Whether you’re comparing cars, sizing a motor, or reading a generator label, this tiny formula saves you from a lot of confusion. Bookmark this page, and you’ll never stare at a kW rating again wondering what it means in horsepower.
